KVM: LAPIC: cap __delay at lapic_timer_advance_ns

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The host timer which emulates the guest LAPIC TSC deadline
timer has its expiration diminished by lapic_timer_advance_ns
nanoseconds. Therefore if, at wait_lapic_expire, a difference
larger than lapic_timer_advance_ns is encountered, delay at most
lapic_timer_advance_ns.

This fixes a problem where the guest can cause the host
to delay for large amounts of time.

Reported-by: Alan Jenkins <alan.christopher.jenkins@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Marcelo Tosatti 2016-06-20 22:33:48 -03:00 • committed by Paolo Bonzini

parent 8d93c874ac

commit b606f189c7

1 changed files with 2 additions and 1 deletions

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arch/x86/kvm/lapic.c

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